Yes its an art... to successfully make a slow paced thriller.
The story unfolds in nice volumes while you don't even notice it happening.
Fine performance by Robin Williams. The sexuality angles in the film can seem unnecessary and can probably affect how much you enjoy the film. However, the core plot is very engaging. The movie doesn't rush onto you and still grips you enough to keep you wondering. The direction is good. Use of lights to achieve desired affects of suspense and unexpectedness is good.
Very nice 1 time watch if you are looking to lay back and hear a thrilling short story!